Using the example I gave you, did you change the test button's click code to send your command instead of the code in the example (standard ATZ command)? You'll have to send your commands (below) to your device in lieu of the code in the example and wait for a response...


>Thanks for your response.
>
>The device uses a Prolific USB to Serial driver on Comm Port 4.
>
>I can type the following in the command window and get the correct data back from the device.
>

>ot = CREATEOBJECT('mscommlib.mscomm')
>ot.CommPort = 4
>ot.Settings='115200,n,8,1'
>ot.PortOpen = .T.
>lqout = 0hA0A20001B700B7B0B3
>ot.Output = lqout
>lqin = ot.Input
>ot.PortOpen = .F.
>CREATE CURSOR test (testrec Q(100))
>INSERT INTO test VALUES(lqin)
>

>
>But when I run the same code in a PRG, the contents of the input buffer are cleared before being assigned to the local varuable.
>
>I copied and ran the comm port tester (making a change for the different baud rate) but got no response from COMM PORT 4.
>
>Thanks in advance for any insight.